The Note (Season 3 Episode 1).
Ralph Bruneau is Roy, the dentist in
The Sniffing Accountant (Season 5 Episode 3).
Ralph Louis Harris is Ralph in
Rance Howard appears in 2 episodes: 1) The Glasses (Season 5 Episode 3) and 2) The Bottle Deposit (Season 7 Episodes 21-22).
The Andrea Doria (Season 8 Episode 10).
Ray Stricklyn is Clarence Eldridge in
The Doorman (Season 6 - Episode 17).
Raymond O'Connor is the Night Doorman in
Reni Santoni is Poppie in 4 episodes. The first: The Pie (Season 5 Episode 15).
Richard Gant plays Fred, of The Equal Employment Opportunity Commission Office in The Pilot (Season 4 Episode 23).
Richard Herd is Matt Wilhelm in 11 episodes. The first: The Jimmy (Season 6 Episode 19).